in case anyone is interested in what transpired
https://skeptics.stackexchange.com/questions/57108/did-the-german-justice-system-convict-a-woman-for-insulting-a-person-who-gang-ra
tl;dr
she was an unrelated 3rd party and sent death threats + general harassment: illegal under german law. the sex offender was 16 at the time, seems like he was convicted as a juvenile.